The manga adaptation of the new Pokémon movie, Pokémon The Movie XY&Z: Volcanion and the Ingenious Magearna (ポケモン・ザ・ムービーＸＹ＆Ｚ ボルケニオンと機巧のマギアナ) will be collected in a volume and released in Japan on July 16, 2016.
The manga is drawn by Kawamoto Kemon (著／河本けもん).
The manga was released in the April issue of CoroCoro Comics (the issue went on sale on March 3, 2016). You can read the news here.